@article{Dong2024, 
author = {Lin Dong and Wen-Qi Yang and Lin Chen and Guan-Jun Yang and Chang-Jiu Li},
title = {Realizing the excellent oxidation resistance of an environmental barrier coating through aluminum surface modification},
year = {2024},
journal = {Journal of Advanced Ceramics},
volume = {13},
number = {7},
pages = {976-986},
keywords = {oxidation, environmental barrier coating (EBC), diffusion, modification, cracking},
url = {https://www.sciopen.com/article/10.26599/JAC.2024.9220911},
doi = {10.26599/JAC.2024.9220911},
abstract = {The lifetime of Si-based environmental barrier coatings (EBCs) is constrained by thermally grown SiO2 oxide layer (SiO2-TGO), which can cause premature cracking and spalling. To address this issue, a new approach for surface modification using aluminum is proposed. The oxidation performance was examined in a 50 vol% H2O–50 vol% O2 environment at 1350 °C for up to 300 h. The results indicate that a dense ytterbium aluminum garnet (YbAG) layer was formed after modification, decreasing the porosity by 80%. Due to the elimination of fast diffusion channels and the low oxygen permeability of YbAG, aluminum modification significantly reduced the growth rate of SiO2-TGO by nearly two orders of magnitude. Consequently, its thickness decreased by more than 70% after 300 h of exposure. A diffusion-controlled oxidation mechanism indicates that the modified dense surface is equivalent to an initial SiO2 layer with a specific thickness, causing a shift in the oxidation time and increasing the oxidation resistance. This research provides valuable insights for designing Si-based EBC with improved lifetimes.}
}